Part of that success, as we've said before, comes from the fact that the company is really just a huge startup -- with a corporate culture that is extremely engineer-focused, emphasizes minimal bureaucracy, and likes taking care of its people.

Sachin Agarwal learned a lot about Apple's management style during his days as an engineer. He worked at the company for 6 years, before leaving to start the simple blogging platform Posterous.

"I loved working there... [Choosing to leave] was a really hard decision," he says.

But, when he left, he made sure to take a few important management lessons with him, which have helped make Posterous successful as well.